Calendar year view issue

### Description

When a Calendar's DisplayMode is set to "Year" in XAML and a DataContext is set, the control will be very wide at runtime. If no DataContext is set either in the ancestors or in the control, it works fine. If DisplayMode = "Month" in XAML (or not set), then there is also no problem when switching to "Year" view.


### Reproduction Steps

**Wrong look:**
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**Wrong look:**
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**Right look:**
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### Expected behavior

Normal width as in Month view.

### Actual behavior

The all instances of CalendarItemStyle's "CalendarItem.DayTitleTemplateResourceKey" element (day titles) display data source string representation (ToString()), but not visible because the DataTrigger hides it (Visibility = Hidden). Set visible to display the text on the screen.

### Regression?

_No response_

### Known Workarounds

_No response_

### Impact

_No response_

### Configuration

_No response_

### Other information

_No response_

[WpfCalendarYearViewIssue.zip](https://github.com/dotnet/wpf/files/12826619/WpfCalendarYearViewIssue.zip)